// export function getUserIP(onNewIP) {
//     let MyPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
//     let pc = new MyPeerConnection({
//       iceServers: []
//     });
//     let noop = () => {
//     };
//     let localIPs = {};
//     let ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/g;
//     let iterateIP = (ip) => {
//       if (!localIPs[ip]) onNewIP(ip);
//       localIPs[ip] = true;
//     };
//     pc.createDataChannel('');
//     pc.createOffer().then((sdp) => {
//       sdp.sdp.split('\n').forEach(function (line) {
//         if (line.indexOf('candidate') < 0) return;
//         line.match(ipRegex).forEach(iterateIP);
//       });
//       pc.setLocalDescription(sdp, noop, noop);
//     }).catch((reason) => {
//     });
//     pc.onicecandidate = (ice) => {
//       if (!ice || !ice.candidate || !ice.candidate.candidate || !ice.candidate.candidate.match(ipRegex)) return;
//       ice.candidate.candidate.match(ipRegex).forEach(iterateIP);
//     };
//   }